Atomic struture of a Na(super +)-and K(super +)-conducting channel

Article Abstract:

Crystal structures of the NaK channel from Bacillus cereus, a non-selective tetrameric cation channel, in its Na(super +)-and K(super +)-bound states is presented. It is concluded that the sequence of the NaK selectivity filter resembles that of a cyclic nucleotide gated channel and its structure may represent that of a cyclic nucleotide-gated channel pore.

Potassium channels, Cations, Sodium channels, Structure, Atomic properties

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A subfemtotesla multichannel atomic magnetometer

Article Abstract:

The magnetic field sensitivity of 0.54 fT Hz(super -1/2) with a measurement volume of only 0.3 cm3 is demonstrated using a new spin-exchange relaxation-free (SERF) atomic magnetometer. The simple multichannel operation of the magnetometer, and localization of magnetic field sources with a resolution of 2mm is presented.

Analysis, Technology application, Magnetometer, Magnetometers

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Measurement of femtometre-scale atomic displacements by X-ray absorption spectroscopy

Article Abstract:

The study shows that magnetostriction can be detected by differential X-ray absorption. The magnitude of the recorded signal relative to the noise shows a sensitivity of mean differential atomic motion of one femtometer which is factor of 100 times more sensitive than that normally available.

United States, Usage, Observations, Electronic structure, Atomic structure, Atomic absorption spectroscopy

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